15=3*4+b

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Solution for 15=3*4+b equation: 



15=3*4+b

We move all terms to the left:

15-(3*4+b)=0

We add all the numbers together, and all the variables

-(b+12)+15=0

We get rid of parentheses

-b-12+15=0

We add all the numbers together, and all the variables

-1b+3=0

We move all terms containing b to the left, all other terms to the right

-b=-3

b=-3/-1

b=+3

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